Planing-machine cutter-head.



E. A. PERKINS & P. H. GLEMENT.

PLANING MACHINE GUTTER HEAD.

APPLICATION FILED APR. 27, 1908. A

'Patented Jan. 19, 1909.

ATTORNEY HIRAM A..rERKiNs END ERANKH. i

AMERiCAN WOOD WORKING MACHINERY TioN OEPENNSYLVANIA.

.'CLEMENT, OERo'CHEsTER, NEW YORK, AssiGNoRs To Co., OE ROCHESTER, NEW YORK, A CORPORA- rLANING-MACHINE CUTTER-HEAD.

Specification of Letters Patent.

Patented Jan. 19, 1909.

` Appleman sied Aprii 27, 190s. serial No. 429,392.

To all whom it may concern: i i y Beit known that We, HIRAM A. PERKINS and FRANK H. CLEMENI,I citizens of the A United States, and residents of the city of Rochester and State of New York, have invented certain Improvements in Planing- Machine Cutter-Heads, pt which the followy ing is a specification,l

Our improvement relates to surfacing' cutter heads 'for wood planing machinesand consists principally in a peculiar construction of knife; receiving slots' and clamping blocks by means of which the knives can be safely clamped into cutting position.

AIt further consists in means of retaining theclamping blocks in the slots in case the knives are removed, andin means ot attachin. in diameter.

`ing beading or molding cutters independf ently of the surfacingvknives.v y

In the drawings Figure 1 is a plan view oi a cutter head made according to our invention. Fig. 2 is an end elevation: Fig. 3 is an enlarged viewA of one' slot and attachments: Fig. 4 shows a modification ofthe clamping screws.

A, is the cutter head. made cylindrical in form with the usual -journals a oi any desiredy diameter and length. In this head we provide a number of longitudinal slots B, corresponding to the. number of knives desired to be used: We have shown four slots as being best adapted to an ordinary head' 7 in. to 8 In Fig. 2 vtwo slots are shown unoccu ied and they'are made up oi the main slot lg, a bottom recess t and a side slot c, which forms a tongue o.' an additional T slot d may also be provided, locted on the C, represents the knives which are plain pieces of bar steel eut'to therequired length and beveled to a'cutting ed e. They are clamped tightly against the plain wall m of the main slots by means of blocks D, and set screws g,` the latter being threaded into thev blocks and having heads fitted to enter loosely the'side slots c. A portion of'the screw head is made square or hexagon Ato receive a wrench and is provided with a cylindrical vextension integral therewith and adapted to bear on the bottom of the slot c. l

. We are aware that a nut having a dove tail extension adapted to be slid endwise .into a slot of like foriniiicross section has been combined with a separate screw and with a block. Our improvement reduces the number of separable parts and provides ior their more convenient assemblage.

It will be seen that the blocks D7 can bel forced against the knives and thus clamp themrigidly against the wall m, of the main slots. A portion h of each block projects into the sub-slot or recess b, and the ledge k, .of this slot or recess becomes a uloruin for the toes h, thus bringing the pressure Obtained by the screws4 g, rimarily on the .knives at the lip n, near t eir cutting edge and secondarily on the ledge 7c. 'lhe said block portion h extends below the knife and nearly fills the 'recess b transversely, and in manner to limit the transverse rocking of the block ywhen loosened, thereby hindering its 'accidental removal. We refer also to clear theI blocksvD, toward the eel of the knives as indicated at Z, Fig. 3 so as to bring the f heaviest pressure on the lips rn., insuring absolute contactV of the knife near the cutting edge and wall m of the main slot: the elasticity of blocks D, is thus utilized between the 'fulcrum line lc and lips n, the screws g,

finally forcing the block against the knifeall alongthe bearing face n, to l.' rl'his construction also enables us to use the knives until they arenearly worn away by use and resharpeiiing. The tongue o, ard the pro` jecting end of thescrews g 'form an element in the lookin g of the blocks D, into the main slots B, and the toesh another element, so that even if the knives becomefloose or are accidental] omitted, the blocks can not Hy out, being llield by the toes 'h acting with the -,ledge lc, and tongue o, the depth of which latter is suiiicient to retain the end of the screws g, when the knives C, are removed. I

We have shown in Fig. 4 a modification of the slots c, tongues o: and clamp screws in which the heads g', are liemispheiicnl and the slots c concave to correspond, the action' being the saine as above described.

E,-Figs. 1, 2 and 8 is ta beading or molding knife which is clamped to a surfacef, forined preferably at a'n angle to the face of the wall m of the main slots. i slot d, Fig. 2 and provide bolts to t'thein for holding the molding or beading knives at an point required on the cylinder, but tap bolts may be used if desired threaded into the cylinder at necessary points along the facef, By this construction of main knife slots with l/Ve prefer to eut a T knives can be attached at any time Without l disturbing the surfacing knives, a great convenience to the mill operator, becausev much time is consumed in removing the surfacing knives or a part of them and substituting beading knives as has heretofore been the practice. speed planers where the surfacing knives have to be jointed up to an exact cutting circle, on the cylinder itself, While running.

Welhave shown the clamp blocks D, of different lengths but it may be found desirable to use continuousblocksas long as the cutting face of the knives. On van ordina diameter of cylinder the knife seat f would need to be bevelin at a greater or less angle than that shown, ut on a large cylinder it would be possible to arrange these knife seats parallel or Vnearly so to the Walls m, and the eading or molding knives would thus make a scrapmg cut on the material.

It will be seen that the cuttin action of the surfacing knives can be varie by grinding the edges with a single bevel as in Fig. 3 or a double bevel as in higs. 2 and 4 and the same is true of the molding knives E. A

VIt is evident that when it is desired to re- I move the blocks D, the screwsh g, can be run into/the blocks far enough to let the ends pass the tongue o, but this condition would not occur in ordinary running unless at the will of the operator.

' Having described our invention, What We claim and desire to secure by Letters Patent is:

1. A planer machine cutter head having two or more recessed knife slots, blocks in the slots to clamp each knife against a Wall of its slot, said blocks having portions extending into the slot recesses, a screw to actuate each of said blocks' transversely to the length of the knife, a recess for the screw head, and a This is especially the case in high aimais ledge 7c in the bottom of each block-containin'g slot and having a continuous block-bearing face parallel With the knife Wall' to engage the ,inner end ofthe block, all substantial y as set forth to prevent its accidental detach-I ment when loosened or when4 a knife is removed.

2. A cutter head having two or more longitudinal slots with knife receiving walls, knife clamping blo'cks in said slots, screws in said clamping b ocks having each an angular part to provide or its manipulation and a rounded y extension to loosely enter a safety slot or recess in a Wall epposite theknife wall, whereby- 'ciiumed at or -near the bottom of the knife slots, and screws` engaging the blocks at a point intermediatev said bearing and fulcrum whereby the knife is pinched hardest near the cutting edge by means of the elasticity f of the blocks.

4. A cutter head having a series of knife slots, each slot having a knife receiving Wall, a clam ing block for securing the knife to said Wa l, and means to actuate the block coacting with a slot Wall opposite said knife wall, said opposite Wall having a beveled face and means to secure on said face a supplement-ary knife.

In testimony whereof We have hereto subi scribed our names in the presence of two subscribing witnesses.

HIRAM A. PERKINS.

Witnesses:

G. C. SOUTHARD, GRACE GRAHAM. 

